Sole Trader Self-Assessment Tracker 2026/27 — income, expenses, mileage & tax estimate

Everything HMRC asks for in January, kept tidy all year. Income log, expenses with the SA103 category dropdown (allowable or not), business mileage at 45p/25p calculated automatically, and a Summary that estimates your income tax and Class 4 NI for 2026/27 so you know what to set aside each month. Key Self Assessment dates included. Figures are estimates, not advice. Format: Excel / Google Sheets (.xlsx). Instant download after payment.